president obama has said immigration reform is at the top of his second term agenda. today his spokesman jay carney welcomed the senate agreement. >> this is a big deal. this is an important development. this is in keeping with the principles the president has been espousing for a long time, in keeping with bipartisan efforts in the past, and with the effort this president believes has to end in a law that he can sign. >> ifill: mr. obama is scheduled to unveil his own ideas on immigration reform tomorrow in las vegas. >> woodruff: so how will the politics of this new effort shake out on capitol hill? we asked two senators from the gang of eight. first my conversation with democratic senator dick durbin of illinois. i talked to the majority whip just a short time ago. senator durbin, thank you very much for joining us. i think one of the main questions i'm hearing is, what does this proposal mean for people living in this country illegally right now? what would happen to them? >> basically it would give them a chance to go through a criminal background check to make c